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Dynamics of the η' meson at finite temperature
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
2014 (English)Independent thesis Advanced level (degree of Master (Two Years)), 80 credits / 120 HE creditsStudent thesis
##### Abstract [en]

At the present time it is unknown how the U(1)A anomaly of Quantum Chromodynamics behaves at high temperatures. We therefore want to look for thermal changes of the effects of the anomaly. For example, by studying the properties of the η' meson at high temperatures it would be possible to deduce important information on the axial anomaly, thanks to the deep connection between them. In this thesis the width of the η' as a function of the temperature is studied in the framework of large-Nc Chiral Perturbation Theory, at next-to-leading order, and in the corresponding Resonance Chiral Theory. We calculate the width increase due to scattering with particles from the heat bath, which we assume to consist of a pion gas. We compare the results obtained in both frameworks and as expected we find a smaller, but still consistent width increase when the more realistic resonance exchange is taken into account. The results suggest that the in-medium width of the η' may increase up to ΔΓ$\approx$ 10 MeV at a temperature of T$\approx$ 120 MeV. We find therefore a width increase of considerable size, comparable to the inverse lifetime of the fireball created in relativistic heavy-ion collisions. In other words, our results suggest that it may be possible to study experimentally how the properties of the η' change at high temperatures.

2014. , 87 p.
##### Series
FYSAST, FYSMAS1025
##### Keyword [en]
effective field theory, chiral perturbation theory, resonance chiral theory, large Nc limit, chiral anomaly
##### National Category
Other Physics Topics
##### Identifiers
OAI: oai:DiVA.org:uu-235790DiVA: diva2:762131
##### Educational program
Master Programme in Physics
##### Examiners
Available from: 2014-11-20 Created: 2014-11-10 Last updated: 2014-11-20Bibliographically approved

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Cite
Citation style
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